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为什么 /var/log/auth.log.1 比 auth.log 小

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为什么 /var/log/auth.log.1 比 auth.log 小

我知道有一个 cronjob 会每隔一定时间轮换 auth.log 文件，但我注意到 auth.log.1 与实际 auth.log 相比很小。auth.log 不是被重命名为 auth.log.1 并创建一个新的 auth.log 吗？

答案1

是与否：

  • 是的，auth.log已重命名为auth.log.1
  • 不，auth.log.1不一定小于，auth.log因为它取决于机器的使用。

例如：在我的计算机上：

ll /var/log/auth*
-rw-r----- 1 syslog adm 209K Nov 30 17:55 /var/log/auth.log
-rw-r----- 1 syslog adm 304K Nov 25 17:08 /var/log/auth.log.1
-rw-r----- 1 syslog adm  27K Nov 18 09:20 /var/log/auth.log.2.gz
-rw-r----- 1 syslog adm  16K Nov 11 07:35 /var/log/auth.log.3.gz
-rw-r----- 1 syslog adm  19K Nov  5 07:35 /var/log/auth.log.4.gz

然而，其他（较旧的）日志被压缩，因此它们确实较小。

答案2

logrotate日志轮换由专门为该任务设计的包进行管理。man logrotate

NAME
       logrotate ‐ rotates, compresses, and mails system logs

SYNOPSIS
       logrotate [-dv] [-f|--force] [-s|--state file] config_file ..

DESCRIPTION
       logrotate  is  designed to ease administration of systems that generate large numbers of log files.  It allows automatic rotation, compression, removal, and mailing of
       log files.  Each log file may be handled daily, weekly, monthly, or when it grows too large.

       Normally, logrotate is run as a daily cron job.  It will not modify a log more than once in one day unless the criterion for that log is based on the  log's  size  and
       logrotate is being run more than once each day, or unless the -f or --force option is used.

       Any  number  of  config files may be given on the command line. Later config files may override the options given in earlier files, so the order in which the logrotate
       config files are listed is important.  Normally, a single config file which includes any other config files which are needed should be used.  See below for more infor‐
       mation on how to use the include directive to accomplish this.  If a directory is given on the command line, every file in that directory is used as a config file.

       If  no  command line arguments are given, logrotate will print version and copyright information, along with a short usage summary.  If any errors occur while rotating
       logs, logrotate will exit with non-zero status.

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